• 대한방사선기술학회지:방사선기술과학
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• 제6권1호
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• pp.131-181
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• 1983

After the investigation on, and the analysis of, the educational system for medical technicians and the present educational situation for medical technologies in this country, the following conclusions were drawn. 1. As of March 1983 the current academic system for education in medical technologies included the regular 4-year college courses and those of the 2-year professional junior college courses. But except in the cases on clinical pathology and physical therapy, there were no college-level departments. Particularly, no educational institutions, at whatever level, had a department for working therapies. 2. The total number of credits needed for graduation from a department of medical technologies was 150 points at a regular 4-year college and 85 to 96 points at a 2-year professional college. The obligatory minimum number of credits for a student at a professional college was set at 80 points and above. 3. As for the number of the educational institutions for medical technologies in this country, there were one regular college and 14 professional colleges, a total of 15 institutions. As many as 14 colleges had departments of clinical pathology, 12 had departments of Radiotechnology, 11 had departments of physical therapy, 12 had departments of dental technology, and eight had departments of dental hygiene. 4. The total capacity of the professional colleges in admitting new enrollment each year were 1,920 for clinical pathology, 1,552 for radiology, 1,012 for physical therapy, 1,334 for dental technologies, 828 for dental hygiene, an aggregate of 6,646 for all of the professional college departments. 5. The total number of graduates from the 12 professional colleges by department during the period of 1965-83 were 7,595 for clindical pathology, 4,768 for radiology, 2,821 for physical therapy, 3,000 for dental technologies, and 1,787 for dental hygiene, totalling 19,971 for all departments in the professional colleges. 6. In the state examination for licensed medical technicians, 12,446 have passed from among the total of 26,609 participants, representing a 45% passing ratio. By departments the ratios showed 44% for clinical pathology, 39.7% for radiology, 51.2% for physical therapy, 42.5% for dental technology, 72.5% for dental hygiene and 73.1% for working therapy. 7. As for the degree of satisfaction shown by the people in this field, 52.2 percent of the teaching staffs who responed to the questionaires said they were satisfied with their present profession, while the great majority of medical technicians(66%) replied that they were indifferent to the problem. 8. The degree of satisfaction shown by the students on their enrollment in this particular academic field was generally in the framework of indifference(43.7%), but mere students(36.5%) were satisfied with their choice than those were not satisfied(14.4%) 9. As for the student's opinions on the lectures and practicing hours, a good many students replied that, among such courses as general science and humanities courses the basic medical course, the major course and practicing hours, the hours provided for the general courses(47.1%) and practicing(47.6%) were insufficient. 10. When asked about the contents of their major courses, comparatively few students (23.6%) replied that the courses were too difficult, while a convincing majority(58.5%) said they were neither difficult nor easy. As for the appropriateness of the number of the present teaching staffs, a great majority(71.0%) of the students replied that the level of the teaching personnel in each particular field was insufficient. 11. Among the students who responded to the poll, good part of them(49.5%) wanted mandatory clinical practicing hours, and the the majority of them(64.6%) held the view that the experimental and practicing facilities of their schools were insufficient. 12. On the necessity of the attached hospitals, 71.1% of the teaching staffs and 58.0% of the medical technicians had the opinion that this kind of facility was indispensable. 13. As for the qualifications for applicants to the state examination in the licensing system for medical technicians, 52.2% of the teacher's and 36% of the medical technicians replied that the present system granting the qualifications according to the apprenticeship period should be abolished. 14. On the necessity of improving the present system for education in medical technologies, an overwhelming majority(94.4% of the :caching staffs, 92.0% of the medical technicians and 91.9% of students) of these polled replied that the present system should be changed for the better. 15. On the method of changes for the present educational system, a great majority(89.4% of the teaching staffs, 80.4% of the medical technicians and 90.1% of the students) said that the system must be changed so that it fits into the reality of the present day. 16. As for the present 2-year program for the professional colleges, 61.6% of the teachers, 72.0% of the medical technicians and 38.8% of the students expressed the hope that the academic period would be extended to four regular years, hemming a full-fledged collegelevels program. 17. On the life-long eductional system for medical technicians, there was a considerable number of people who expressed the hope that an open university system(38.9% of the teaching staffs, 36.0% of the medical technicians) and a graduate school system would be set up. 18. As for the future prospects for medical technicians as professionals, the optimists ana pessimists were almost equally divided, and 41.1% of the teaching staffs 36.0% of. the technicians and 50.5% of the students expressed an intermediate position on this issue.

• 대한치과기공학회지
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• 제27권1호
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• pp.19-25
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• 2005

Ti6Al4V alloy have been mainly used as implant materials. Ti-6Al-4V alloy instead of pure Ti is being widely used as biomaterials has some characteristics such as high fatigue strength, tensile strength. But it has been reported recently that vanadium component expresses cytotoxicity and carcinogenicity and aluminium component is related with dementia of Alzheimer type. In order to overcome their detrimental effects, $\beta$-phase stabilizer Nb was chosen in the present study, in addition Ta and Hf were added to Ti-40wt.%Nb alloy to improve its mechanical properties. This paper was described the influence of heat treatment of Ti-40Nb alloys with 2wt%Ta, 2wt%Hf on the mechanical properties. Specimens of Ti alloys were melted in vacuum arc furnace and homogenized at 1050$^{\circ}C$ for 24 hr. and then were aged after solution heat treat at $\alpha+\beta$ and $\beta$ regions. The mechanical properties of Ti alloys were analysed by hardness test, tensile test, elongation test and SEM test. The results can be summarized as follows: 1. The mechanical properties Ti-40wt.%Nb were improved when 2wt.% Ta and 2wt.%Hf were added. 2. The higher tensile strength value and elongation at solution heat treat was higher than solution heat treat and then were aged.

• 대한치과기공학회지
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• 제17권1호
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• pp.41-57
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• 1995

전문대학의 교육목표는 중견기술인을 교육하고 직업교육을 통하여 현장에 취업케 하는 것인바, 치기공과는 치과보철학의 이론 및 실습을 통하여 치과에서 의뢰한 치과기공물을 제작할 수 있는 치과기공사를 교육하는 학습내용이 요구된다. 임상실습은 3년제 교과과정의 가장 중요한 부분으로 대부분의 전문대학이 임상실습 학점을 강제규정으로 요구하고 있으며 임상실습은 단순한 실기능력 향상 만을 기대하기보다는 실기능력 향상과 이에 따른 실무적응능력과 취업률의 향상, 그리고 치과기공소의 유능한 기공사의 확보에 있어 임상실습의 3년제 교과 과정중 가장 중요한 점으로 인식되고 활용되어야 한다. 그러나 임상실습은 본인과 학교의 노력만으로 되는 것이 아니고 기관의 임상실습의 중요성에 대한 인식과 전폭적인 지원이 요구되어야 하며 임상실습은 취업과 연계되어 치과기공사의 질적인 향상은 궁극적으로는 치과기공소의 경영에 유익을 주는 것이다. 3년제 교과과정의 임상실습을 산학협동체제로 교육함에 있어 졸업 후 취업현장에 바로 투입될 수 있도록 운영되어야 하는데, 임상실습기관에 대한 사전 정보를 수집하고 분석하며 임상실습기관과 유기적인 관계를 맺는 것은 임상실습교육의 효율적인 운영과 실습효과의 제고와 이에 따른 취업율을 향상시킬 수 있는데 도움이 되고자 본 대학의 서울지역 임상실습기관과 협조 의뢰하게 될 27개 치과기공소 대표자를 대상으로 설문조사를 하고 이와 아울러 전국 14개 전문대학 치기공과 교과과정표에 나타난 임상실습교과목을 검토하여 다음과 같은 결과를 얻었다. 임상실습기관 대표자의 연령은 35-39세가 40.7%로 가장 많았고, 남자가 96.3%로 대부분이며 학력은 전문대 졸업 이상이 97.5%와 경력 10년 이상이 92.6%이며 85.2%가 도재기공물 분야에 주력하고 있었다. 교육을 위한 세미나실이 준비되어 있는 기공소는 29.6%였는데, 건평이 40평 이상인 기공소에서는 11.1%로 가장 높았고, 30-34평과 35-39평이 각각 7.4%였다. 치과기공소의 경영측면에서 치과기공소에 제작하는 기공물의 종류를 보면, 전 분야의 기공물을 제작하는 곳은 29.6%였으며, 교정장치물 또는 토재기공물의 단일 품목만을 전문으로 하는 곳은 각 각 7.4%와 3.7%였다. 거래치과수는 30-39개소가 40.7%가 가장 많았고, 1일 의뢰 건수는 10-19건수가 40.7%가 가장 많았고, 의뢰받은 기공물의 제작기일은 77.8%가 3-4일이었다. 임상실습에 대한 협조 의뢰에 대하여 충분히 고려한 후 수락하겠다가 51.9%, 순서대로 수락하겠다가 36.0%였고 교육가능 인원은 1개 대학 3명까지가 40.7%, 2개 대학 3명까지가 37.0%였다. 기공소 대표자 3년제 교육과정 연장에 따라 졸업생에 대한 견해는 3년제 교육과정 교육연한의 연장으로 인한 3년제 졸업생들의 초임을 포함한 임금에 대한 견해는 지급 수준보다 높아야 한다가 44.4%, 그렇지 않다가 55.5%로 더 높았고, 3년제 졸업생들은 2년제보다 치과기공사로서 직업에 종사하는 비율이 증가할 것이라고 기대하는 사람은 74.1%나 되었고, 교육과정 연장에 따라 이론 및 실기 모두가 향상할 것이라고 기대하는 것은 51.9%, 실기면에서 우세할 것이 29.6%, 이론이 향상할 것이다는 14.8%의 순서로 96.3%가 향상될 것으로 기대하고 있어 긍정적인 견해를 가지고 있었다. 임상실습시 기대는 단지 실습기회만 제공한다가 59.3%였고, 임상실습시 별 문제가 없었다가 33.3%였으나 시간낭비와 번거롭다가 25.9%, 29.0%였으며, 임상실습시 강조점은 투철한 직업관 확립이 44.4%로 가장 높았다. 본 대학 임상실습기관으로 협조 의뢰 할 치과기공소는 임상실습을 위하여 선별된 것으로 비교적 규모면에서 면적이 널고 경영상태가 양호하나, 대부분의 기공소는 경영규모가 영세하고 작업 환경이 열악하므로 실습생을 교육할 수 있는 일정 규모 이상의 임상실습기관을 확보하기가 어렵고, 임상실습기관인 치과기공소는 단지 실습지를 제공하는 공급자의 입장에서 실습지도를 할 인력이나 시간도 제한되어 있다. 따라서 학교 간의 일정한 시간 차를 두어 실습시기를 탄력적으로 운영하며, 치과기공소의 경영유형에 따라 일부 기공물을 제작하지 않는 곳도 있고 또 단일 품목의 전문 치과기공소도 있어서 이들은 상호 연결하여 실습생들이 실습기관을 순환하는 방법을 활용하는 것이 바람직하며 산학협동차원에서 임상실습이 취업이 연계될 수 있도록 인턴사원제로 적극 활용을 유도해야 할 것으로 사료된다.

• 대한치과기공학회지
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• 제20권1호
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• pp.51-60
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• 1998

The artificial resin teeth used for removable prosthesis have good physical properties, but they have great wear rate. The purpose of this study is to compare the wear characteristics of several artificial resin teeth, such as Myerson teeth(Myerson Crop), Trubite IPN(Dentsply), Endura Posterio(Shofu), SROrthosit(Ivoclar), Trubite Biotone(Dentsply), Five samples of each resin tooth were abraded against natural teeth, type III gold for 150,000 cycles on the wear machine. The results obtained were as follow 1. The wear rate of artificial resin teeth when opposing enamel was the lowest in Myerson teeth($8.60{\mu}m$), followed by Trubite IPN($41.30{\mu}m$), Endure poster($63.00{\mu}m$), SR-Orthosit($68.40{\mu}m$), Trubite Biotone($209.90{\mu}m$) 2. The wear rate of artificial teeth when opposting type III gold specimens was the lowest in Myerson teeth($13.50{\mu}m$) followed by Endura Posterio($14.75{\mu}m$), Trubite IPN($53.40{\mu}m$), SROrthosit($54.20{\mu}m$), Trubite Boitone($341.50{\mu}m$)

• 대한치과기공학회지
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• 제28권2호
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• pp.331-346
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• 2006

Free-end partial dentures, which are supported by teeth surrounded by dental root membranes and elastic mucous membrane tissues, may cause stress to the abutment teeth due to external force imposed on the denture base, increase the mobility of the abutment teeth, and bring about a change in the periodontal tissue. General retainers used in partial dentures are categorized into clasp, attachment, and Konus crown. Stress imposed on the abutment teeth and mobility of the denture base have relations with the lifetime of a crown and abutment teeth, and have direct relations with the chewing ability. Thus, a need arises to make a comparative analysis of stress of the three direct retainers on the abutment teeth and interpret the mobility of the denture base. This study designed three kinds of removable partial dentures (one kind of attachment partial denture, one kind of Konus crown partial denture, and one kind of clasp partial denture), and fabricated Dentiforms of bilateral partial dentures (Kennedy Class I) with lower left 1st premolar and lower right 1st and 2nd premolars being as the abutment teeth. A strain gauge was installed in the mesial and distal surface of the lowerr left 1st premolar (No. 34) of the fabricated dentiform and in the lower part of the denture base, and installed were a clasp partial denture, an attachment partial denture, and a Konus crown partial denture. Then, the vertical static load of 5kgf and 7.5kgf at the occlusion surface of the lower left No. 6 molar was generated for a total of 20 frequencies of load each using a push-full gauge, and thus a change in the output of the strain gauge was measured. With the respective application of Konus crown, attachment and RPI clasp in the free-end partial denture, surveyed was the distribution of stress imposed on the abutment teeth and the denture base according to the location of occlusion force load so as to come up with the following results. 1. Konus crown and attachment partial dentures generated much stress, and more stress on the abutment teeth than RPI clasp dentures did. Attachment dentures tended to further intensify stress on the abutment teeth than Konus crown dentures did. 2. Attachment dentures and Konus dentures imposed less stress on the denture base than RPI clasp dentures did. There was no stress difference between Attachment and Konus crown dentures. 3. Dentures that were designed with the application of retainers using sturdy linkage methods tended to be less mobile.

• 한국식품영양과학회지
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• 제38권7호
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• pp.951-957
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• 2009

본 연구는 추출용매의 농도에 따른 추출수율 및 항균성을 측정하였으며 항산화 활성과 항균활성의 상관관계를 검토하고, 분획 용매에 따른 치아우식균에 대한 항균성 등을 측정하여 천연 항균제인 인삼추출물의 치아우식 예방에의 이용 가능성을 확인하기 위하여 실시하였다. 백삼 원료의 수분 함량은 20%, 배럴온도는 $100^{\circ}C$, $140^{\circ}C$ 두 조건으로 압출성형 하였다. 항균성 측정 결과 디스크 확산법은 S. mutans보다 L. casei 균에 대한 저해율이 높았으며 60% Et-OH 추출물이 항균활성이 컸다. GTase 또한 디스크 확산법과 같이 60% Et-OH에서 S. mutans에 대한 우수한 저해효과를 보였다. 반대로 최소저해농도 측정에서는 Et-OH 농도 80%가 60%보다 모든 인삼추출물에서 항균활성이 높게 나타났고 인삼추출물의 농도가 높아질수록 저해율도 증가하였다. L.casei 균에 대한 저해율은 대부분 150 mg/mL 농도부터 저해가 진행되었지만 $140^{\circ}C$ 압출성형 백삼은 100 mg/mL 농도부터 저해가 진행되면서 높은 저해효과를 보였다. 분획 용매에 따라서는 n-butanol과 n-hexane 추출물에서 항균성을 보였으며 사포닌과 함께 페놀계 화합물이 용출되면서 n-butanol 분획의 항균활성이 증가한 것으로 사료된다.

• 대한치과기공학회지
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• 제33권1호
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• pp.25-35
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• 2011

Purpose: There are some advantages of the acrylic resin denture base ; appropriate strength, volume safety, simple processing apparatus, and low cost. But, it have a weakness for fracture by intense pressure or shock. However, the repairs for resin denture base are possible using various materials and techniques. There is a few studies in repairs for resin denture base, but not clinical researches. And there is no studies in absorbed saliva into the region of fracture and bond strength. This study is to observe re-bond strength of resin denture base after repairing under saliva absorption. Methods: The samples were made of heat curing resin and the rectangular parallelepiped specimens which were 50mm long, 10mm wide and 3mm high. The four different groups immersed in the artificial saliva for 2 weeks were prepared, 1) no repaired control samples, 2) immediately repaired samples, 3) repaired samples after 1 day dry, and 4) repaired samples after 3 days dry. The prepared samples were repaired by two different curing materials, self curing resin and heat curing resin method. Each groups composed of 10 specimens were experimented with the three point bending tests for bonding strength measuring Results: There were under condition absorbed in the artificial saliva and repaired by self curing resin method, repaired specimens after 1 day and 3 days dry groups had higher values of bonding strengths than control group, and bonding strengths of immediately repaired samples were similar to those of control samples (p<0.05). There were under condition immersed in the artificial saliva and repaired by heat curing resin method, immediately repaired samples showed similar values to bonding strengths of control groups, and repaired samples after 1 day and 3 days dry groups were lower than those of control group (p>0.05). Conclusion: In this study, the repairs for resin denture base were remarkably high values of bonding strengths than those of the past, and showed that have stable bonding strengths independent of saliva absorption of denture base, so present repairs for resin denture base can be performed, regardless of saliva conditions.

• 융합정보논문지
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• 제9권10호
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• pp.227-233
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• 2019

본 연구는 치위생(학)과와 보건계열 학생들을 대상으로 2018년 6월에서 7월까지 생명윤리의식을 파악하여 생명윤리 교육과정 개발에 필요한 기초자료를 제공하고자 설문조사하였다. 생명권과 인공수정 인식도의 관한 상관관계는 성별(r=0.241), 종교(r=-0.176), 학과(r=-0.160)에서 유의하였고, 장기기증 및 장기이식에 관한 인식도에 관한 상관관계는 학년(r=0.129), 종교(r=-0.098), 생명윤리 교육여부(r=0.235)에서 유의하였다. 안락사의 인식도에 관한 상관관계는 종교(r=0.139), 생명윤리교육 여부(r=-0.157)에서 유의하였다. 결과적으로 보건계열 대학생들에게 바람직한 윤리관을 확립하기 위해서는 교육과정을 개발하고 생명의료 윤리의식에 영향을 미치는 요인을 다각적으로 분석하여 체계적으로 교육 프로그램을 운영해야 할 것이다.

• 한국방사선학회논문지
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• 제6권2호
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• pp.137-142
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• 2012

본 연구는 구강 내 방사선 촬영 시 동일조건 하에서 촬영장비의 기종을 다르게 한 경우와 동일 기종에서 노출조건을 일정하게 하였을 경우 획득되는 방사선의 선량변화를 알아보고자 하였다. 장비의 기종에 따른 변화를 알아보기 위해 3대의 각기 다른 촬영 장치를 이용하여 상악 전치부, 소구치부, 대구치부의 3가지의 촬영조건을 이용하여 선량을 측정하였고 장치의 재현성 검사를 위해서 각 장치에 동일한 조건으로 3회 조사하여 선량변화를 알아보았다. 선량의 측정은 반도체 측정기를 사용하였으며, 필름의 농도값을 획득하여 진단에 유효적인 범위에 만족하는지 분석해 보았다. 같은 촬영기를 사용하여 실험한 결과 각 부위별로 선량의 차이는 최대값과 최소값이 적게는 3배 많게는 10배의 선량 차이를 보였다. 흑화도의 범위 또한 적절한 범위인 0.25~2.0를 초과한 2.10~2.95의 허용범위를 보였다. 동일한 촬영기로 특정 부위를 같은 조건에서 촬영하더라도 측정된 선량값은 큰 차이를 보였으며 필름의 농도 분석의 결과 적합한 농도 분포를 보이지 않았던 것으로 나타났다. 이는 환자의 재촬영을 발생시킬 수 있으며 진단시 오류를 일으킬 수 있어 환자의 피폭에 직 간접적인 피해를 일으킬 수 있다. 따라서 치과 방사선 촬영장치 또한 정기점검이 필요할 것으로 생각되며 표준화된 촬영조건과 현상조건이 제공되어야 한다고 사료된다.

• 대한치과기공학회지
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• 제33권1호
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• pp.37-45
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• 2011

Purpose: Heat pressed ceramics, used for all ceramic restorations, have the additional advantage of being technically less change through using of the lost-wax technique. Conceptually, combining the ceramic with the clinically proven reinforcing ability of a metal framework would be advantageous; however, cause of mismatching of fusion between ceramics and metal frameworks which from differences of casting temperature and coefficient of thermal expansion, pressed ceramics could not be used with a metal framework. The purpose of this study was to compare shear bond strength of press-to metal ceramic to porcelain fused non precious metal and feldspatic porcelain fused non precious metal. Methods: The 30 metal specimens were casted in a porcelain fused non precious metal nickel-chromium alloy. They were divided into 3 groups by surface treatment and applied ceramic: $125{\mu}m$ aluminium oxide sandblasting and veneered feldspatic porcelain (group FP), $125{\mu}m$ aluminium oxide sandblasting and had press-to-metal ceramic applied (group PC), porcelain bonder (gold bonder) fused on surface of metal specimens and had press-to-metal ceramic applied (group PCG). In each group 10 metal specimens were used. The press-to-metal ceramic applied 20 specimens had ash-free wax pattern applied, the metal-wax complexes invested, and were pressed with heat press ceramic. All specimens were subjected to shear bond strength test at a crosshead speed of 1.0 mm/min. Results: The results of measured in Mean SD and data were analyzed by one-way AVOVA (p= .05) and Tukey HSD test (p= .05).: group FP $16.090{\pm}1.841$ MPa, group PC $12.620{\pm}1.8256$ MPa, group PCG $10.920{\pm}0.9283$, significant differences between all groups (p < .05). Significant differences were found in each between group FP and group PC, group FP and group PCG (p < .05). Conclusion: The shear bond strength of press-to-metal ceramic to porcelain fused non precious metal was described higher in unused gold bonder group than used gold bonder groups.